Engines Market

Mercedes Viano 3.2 / 3.7 V6 Specialists

Mercedes Benz Viano 3.2 V6 / 3.7 V6 Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz Viano 3.2 V6 and 3.7 V6 engine specialists. Compare prices on reconditioned, rebuilt and used M112 V6 petrol engines - supply & fit available nationwide.

Supply & Fit Available
12-Month Warranty
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100+ Suppliers
Mercedes Benz Viano 3.2 V6 / 3.7 V6 Engine
from£2,000 to £3,800
  • Usedfrom £800
  • Reconditionedfrom £1,600
  • Common codesM112.951, M112.970
Mercedes Benz viano 3.2 V6 / 3.7 V6 Used Engine — M112.951Mercedes Benz vianoUsed Engine — M112.951Mercedes Benz viano 3.2 V6 / 3.7 V6 Reconditioned Engine — M112.951Mercedes Benz vianoReconditioned Engine — M112.951Mercedes Benz viano 3.2 V6 / 3.7 V6 Rebuilt Engine — M112.951Mercedes Benz vianoRebuilt Engine — M112.951

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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Mercedes Benz Viano 3.2 V6 / 3.7 V6 Engine History & Specs at a Glance

The Mercedes Benz Viano 3.2 V6 and 3.7 V6 represented the premium petrol options in the W639 Viano range, powered by the M112 family of 18-valve SOHC V6 engines. While rare in the UK market - petrol Vianos account for under 10% of sales - these smooth, refined units offered effortless power delivery at the cost of significant fuel consumption【10†L30-L31】.

Mercedes Benz Viano 3.2 V6 / 3.7 V6
  1. 2003

    W639 Viano launched with M112.951 3.2L V6 petrol, 190hp (140kW), 270Nm torque, 5-speed automatic transmission

  2. 2005

    M112.970 3.7L V6 petrol introduced as a special-order option, 235hp (175kW), 350Nm torque

  3. 2008

    M112 3.2L V6 discontinued as M272 3.5L V6 replaced it in facelift models

  4. 2010

    M112 3.7L V6 production ends as facelift Viano range transitions to M272 petrol units

Every M112 V6 petrol engine fitted to the Mercedes Benz Viano 3.2 and 3.7 is covered below, with UK rebuilt pricing and known failure points from real owner experience【1†L19-L20】.

Engine Codes & Pricing

Mercedes Benz Viano 3.2 V6 / 3.7 V6 Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

M112.951 — 3.2L V6 Petrol (2003-2008) engine

M112.951 — 3.2L V6 Petrol (2003-2008)

Power Output
190 hp (140 kW) @ 5,600 rpm
Torque
270 Nm @ 2,750-4,750 rpm
Displacement
3,199cc
Configuration
V6, SOHC 18-valve, naturally aspirated, 3-valves per cylinder
Years Fitted
2003-2008

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Common Problems

Mercedes Benz Viano 3.2 V6 / 3.7 V6 Engine Problems Repair Cost vs Replacement

The Mercedes Viano 3.2 V6 and 3.7 V6 rely on the M112 V6 petrol engine - a smooth and refined unit that delivers effortless power, but has developed a well-documented reputation for predictable failures as mileages climb. Head gasket degradation, oil leaks from camshaft plugs, and thermostat failures are the most frequently cited issues【10†L20-L21】. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty. Below we break down the most common Viano 3.2 and 3.7 V6 engine failures, what they cost to fix, and when replacement is the smarter financial decision.

Common failure points and repair options

M112 Head Gasket Failure

Affected
Mercedes Viano 3.2 V6, 3.7 V6 (M112.951, M112.970, 2003-2010)
Typical failure mileage
80,000 - 150,000 miles
Root cause
The M112 V6 uses a composite head gasket design that is prone to degradation over time, particularly if the engine has been overheated. Coolant can leak into the oil galleries or oil into the cooling system, leading to overheating, loss of performance, and eventual engine damage【10†L20-L21】.

Repair options

Repair tierDealer priceSpecialist price
Head Gasket Replacement (Both Banks)£1,800-£2,800£1,200-£1,800
Full Replacement - Rebuilt M112 Engine£4,000-£5,500£2,200-£3,800
Our recommendation
If you notice coolant loss without an external leak, oil in the coolant, or white smoke from the exhaust, have the head gaskets inspected immediately. Specialist head gasket replacement with MLS upgraded gaskets (£1,200-£1,800) is a permanent fix - use a specialist who has experience with M112 engines and can fit the updated MLS gaskets rather than OEM composite units.
-> Compare rebuilt M112 engine prices for your Viano 3.2 / 3.7 V6

M112 Oil Leaks

Affected
Mercedes Viano 3.2 V6, 3.7 V6 (M112.951, M112.970, 2003-2010)
Typical failure mileage
60,000 - 120,000 miles
Root cause
The M112 V6 is prone to oil leaks from multiple locations - camshaft plugs (30mm and 65mm), rocker cover gaskets, and oil cooler seals. These leaks are common on higher-mileage examples and can lead to oil loss, belt contamination, and eventual engine damage if ignored【10†L20-L21】.

Repair options

Repair tierDealer priceSpecialist price
Rocker Cover Gasket Replacement£400-£700£250-£450
Camshaft Plug & Oil Cooler Seal Replacement£600-£1,000£350-£650
Full Replacement - Rebuilt M112 Engine£4,000-£5,500£2,200-£3,800
Our recommendation
Oil leaks on the M112 are rarely urgent but should not be ignored - oil dripping onto the exhaust manifolds can create smoke and, in extreme cases, fire risk. The specialist camshaft plug and oil cooler seal replacement (£350-£650) addresses the most common leak points in one go, saving on labour versus doing each repair individually.
-> Compare rebuilt M112 Mercedes Viano 3.2 / 3.7 V6 engine prices

M112 Thermostat & Cooling System Failure

Affected
Mercedes Viano 3.2 V6, 3.7 V6 (M112.951, M112.970, 2003-2010)
Typical failure mileage
70,000 - 120,000 miles
Root cause
The map-controlled thermostat can fail, causing temperature fluctuations and potential overheating. The cooling system on the M112 is critical to engine longevity - overheating can accelerate head gasket failure【10†L21】.

Repair options

Repair tierDealer priceSpecialist price
Thermostat Replacement£300-£500£150-£300
Full Cooling System Refresh£600-£1,000£350-£650
Full Replacement - Rebuilt M112 Engine£4,000-£5,500£2,200-£3,800
Our recommendation
The M112's map-controlled thermostat is a known weak point - if you notice the temperature gauge fluctuating or the engine taking too long to warm up, replace the thermostat immediately. On higher-mileage examples, a full cooling system refresh (£350-£650) is recommended to prevent overheating-related head gasket failure.
-> Get quotes for M112 cooling system repairs for your Viano 3.2 / 3.7 V6

Don't Let Engine Failure Write Off Your Mercedes Viano 3.2 or 3.7 V6

A failed M112 V6 engine doesn't have to mean the end of your Viano. Whether you're dealing with head gasket failure, oil leaks, or cooling system issues, EnginesMarket makes it simple to compare prices from trusted UK Mercedes Viano specialists. Every rebuilt engine in our network includes upgraded components designed to address the original failure point, a minimum 12-month unlimited mileage warranty, and nationwide delivery with supply & fit options available.

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FAQ

Mercedes Viano 3.2 V6 / 3.7 V6 Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz Viano 3.2 V6 / 3.7 V6 owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

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Comparing quotes for your Mercedes Viano 3.2 or 3.7 V6 engine replacement is completely free and carries no obligation - enter your registration above, receive tailored prices from UK specialists who know the M112 V6 petrol engine inside out, and get back on the road with confidence. Every rebuilt engine is backed by a minimum 12-month unlimited mileage warranty.

100+100+ Viano V6 engines supplied through our network
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